package com.ruoyi.common.swagger.config;

import cn.dev33.satoken.config.SaTokenConfig;
import com.github.xiaoymin.knife4j.spring.annotations.EnableKnife4j;
import com.ruoyi.common.swagger.config.properties.SwaggerProperties;
import io.swagger.models.auth.In;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.service.*;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spi.service.contexts.SecurityContext;
import springfox.documentation.spring.web.plugins.ApiSelectorBuilder;
import springfox.documentation.spring.web.plugins.Docket;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;

/**
 * Swagger 文档配置
 *
 * @author Lion Li
 */
@Configuration
@EnableKnife4j
@EnableConfigurationProperties(SwaggerProperties.class)
@ConditionalOnProperty(name = "swagger.enabled", matchIfMissing = true)
public class SwaggerAutoConfiguration {

    @Autowired
    private SaTokenConfig saTokenConfig;

    /**
     * 默认的排除路径，排除Spring Boot默认的错误处理路径和端点
     */
    private static final List<String> DEFAULT_EXCLUDE_PATH = Arrays.asList("/error", "/actuator/**");

    private static final String BASE_PATH = "/**";

    @Bean
    public Docket api(SwaggerProperties swaggerProperties) {
        // base-path处理
        if (swaggerProperties.getBasePath().isEmpty()) {
            swaggerProperties.getBasePath().add(BASE_PATH);
        }
        // noinspection unchecked
        List<Predicate<String>> basePath = new ArrayList<>();
        swaggerProperties.getBasePath().forEach(path -> basePath.add(PathSelectors.ant(path)));

        // exclude-path处理
        if (swaggerProperties.getExcludePath().isEmpty()) {
            swaggerProperties.getExcludePath().addAll(DEFAULT_EXCLUDE_PATH);
        }

        List<Predicate<String>> excludePath = new ArrayList<>();
        swaggerProperties.getExcludePath().forEach(path -> excludePath.add(PathSelectors.ant(path)));

        ApiSelectorBuilder builder = new Docket(DocumentationType.OAS_30)
            .enable(swaggerProperties.getEnabled())
            .host(swaggerProperties.getHost())
            .apiInfo(apiInfo(swaggerProperties))
            .select()
            .apis(RequestHandlerSelectors.basePackage(swaggerProperties.getBasePackage()));

        swaggerProperties.getBasePath().forEach(p -> builder.paths(PathSelectors.ant(p)));
        swaggerProperties.getExcludePath().forEach(p -> builder.paths(PathSelectors.ant(p).negate()));

        return builder.build()
            .securitySchemes(securitySchemes())
            .securityContexts(securityContexts())
            .pathMapping("/");
    }

    /**
     * 安全模式，这里指定token通过Authorization头请求头传递
     */
    private List<SecurityScheme> securitySchemes() {
        List<SecurityScheme> apiKeyList = new ArrayList<>();
        String header = saTokenConfig.getTokenName();
        apiKeyList.add(new ApiKey(header, header, In.HEADER.toValue()));
        return apiKeyList;
    }

    /**
     * 安全上下文
     */
    private List<SecurityContext> securityContexts() {
        List<SecurityContext> securityContexts = new ArrayList<>();
        securityContexts.add(
            SecurityContext.builder()
                .securityReferences(defaultAuth())
                .operationSelector(o -> o.requestMappingPattern().matches("/.*"))
                .build());
        return securityContexts;
    }

    /**
     * 默认的全局鉴权策略
     */
    private List<SecurityReference> defaultAuth() {
        AuthorizationScope authorizationScope = new AuthorizationScope("global", "accessEverything");
        AuthorizationScope[] authorizationScopes = new AuthorizationScope[1];
        authorizationScopes[0] = authorizationScope;
        List<SecurityReference> securityReferences = new ArrayList<>();
        securityReferences.add(new SecurityReference(saTokenConfig.getTokenName(), authorizationScopes));
        return securityReferences;
    }

    private ApiInfo apiInfo(SwaggerProperties swaggerProperties) {
        return new ApiInfoBuilder()
            .title(swaggerProperties.getTitle())
            .description(swaggerProperties.getDescription())
            .license(swaggerProperties.getLicense())
            .licenseUrl(swaggerProperties.getLicenseUrl())
            .termsOfServiceUrl(swaggerProperties.getTermsOfServiceUrl())
            .contact(new Contact(swaggerProperties.getContact().getName(), swaggerProperties.getContact().getUrl(), swaggerProperties.getContact().getEmail()))
            .version(swaggerProperties.getVersion())
            .build();
    }
}
